--Which floor do you live?The first floor. And I live Room 2046.A. on; inB. on; onC. in

问题补充：

--Which floor do you live? --The first floor. And I live Room 2046.

A. on; in

B. on; on

C. in; on

D. in; in

答案：

(答案→)A. on; in

B. on; on

C. in; on

D. in; in

解析：on在上面;in在里面.句意:你住在几楼?一楼.并且我住在2046房间.英语中楼层属于一个平面,故用介词on,房间是一个空间范围,故用介词in,选A.